Wheel center



FIG. 1 is a front elevational view of a wheel center showing _my new design;

FIG. 2 is an end elevational view thereof with the front of the wheel _center facing upwardly;

FIG. 3 is a cross-sectional view thereof taken along the line 3--3 in FIG. 1;

The broken lines in FIGS. 1, 2, and 3 of the drawings are for illustration purposes only. 

The ornamental design for a wheel center, as shown and described. 